ac·cel·er·om·e·ter

[ak-sel-uh-rom-i-ter]
noun
an instrument for measuring acceleration, as of aircraft or guided missiles.

Origin:
1900–05; acceler(ation) + -o- + -meter

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World English Dictionary
accelerometer (ækˌsɛləˈrɒmɪtə) [Click for IPA pronunciation guide]
 
n
an instrument for measuring acceleration, esp of an aircraft or rocket

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Cite This Source
00:10
Accelerometer has a plethora of syllables.
So is sesquipedalianism. Does it mean:
given to using long words.
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
Example sentences
One accelerometer is located under the grip, preferably at a point between the
  two hands.
When an accelerometer in the mirror detects an impact, a call is automatically
  placed to the command center.
He made himself a fine little floater-type accelerometer.
Low activity, as recorded by the accelerometer, suggests the wearer is sleeping.
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